import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/getParameter")
public class GetParameter extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        //前端通过url的query string传递 username和password两个属性
        String username = req.getParameter("username");
        if(username == null){
            System.out.println("username 这个 key 在query string中不存在！");
        }
        String password = req.getParameter("password");
        if(password == null){
            System.out.println("password 这个 key 在query string中不存在！");
        }
        System.out.println("username : " + username+", password : "+password);
        resp.getWriter().write("ok");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf8");
        //前端通过body，以form表单的格式，把username和password传给服务器
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        if(username == null){
            System.out.println("username 这个 key 在query string中不存在！");
        }
        if(password == null) {
            System.out.println("password 这个 key 在query string中不存在！");
        }
        System.out.println("username : " + username+", password : "+password);
        resp.getWriter().write("ok");

    }
}
